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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed77601d8a5247b532ce1468dc21e37f05640989b0ed20ee4b4233e4ecbe575' 
  AND token = 'XR+b62Qkm1bIwvbXnyKTOMZQGcqjFvrIlSk0puAoiSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}